Expansion-joint for concrete constructions.



J. A. DE Momo.' EXPANSION .IOINT FOR CONCRETE CONSTRUCTIONS.

APPLICATION FILED JUNE 2.1916.

Patented Sept. 1I, 191'?.

n 'ne Arette inercia,

JOHN n. 4'DE Monia., or JaICnMoND, CALIronNrA.

Mision-Joram Fon CoNCRETn CoNsTnUCTIoNs.

Specification of Letters Patent. Patented Sept.' 111i, 3191i 7.,

Appuatia inea :rune 2, 191e. serial No. 101,306.

-a full, clear, Iand exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The primary object of this invention is the provisionof a novel type of .expansion joint for use in concrete construction, particularly a pavement, which will admit of adjacent blocks being laid in close relation to each other so as to lessen the space between the blocks. y

Another object of the invention'is the provision of an expansion joint, which will prohibit the grouth of vegetatlon, such as weeds and grass, between the adjacent blocks.

A further object of the invention is the provision of an expansion joint formed of companion sheets of tarboard, or similar flexible material, having a filler therebetween, the said filler being composed of asphaltum and rock salt, and means associated with the sheets for preventing escape of the filler from .between the sheets. Y

A still further object of the invention is the provision of an expansion joint, for carrying out the above'object, which can be conveniently and expeditiously placed in operative position, and will be of simple and durable construction, cheap to manufacture and efficient in operation.

Other objects .will appear and be better understood from that embodiment of-my invention of which the following is a specification, reference being had to the accompanying drawing forming a part thereof, in w `chz Figure'l is a top plan view of a concrete construction undergoing completion, showing the improved expansion joint'invoperative position, 'v l Fig. 2 is a vertical section, taken through a completed concrete structure, and showing the expansion joint in operative position.

' Fig. 3 is a perspective view of the expansion joint removed from operative position.

Referring to the drawing in detail, the letter A designates a concrete construction,

which for conventional purposes is shown4 as av pavement, and being formed of individual blocks designated B and C. In Fig.

1 the block B is shown complete, and the block C undergoing the usual molding operation andv partly completed.

. rIthe expansion joint is designated, as an entirety, by the numeral 1 and consists of companion sheets of tarboard or the like, designated 2 and 3, the said sheets being c0- equal'in length and width. The sheet 3 is prdvided with a horizontally disposed bulged portion 4, which is located at a point adjacentv the upper edge of the sheet 3, and a ller 5 is interposed between the sheets 2 and 3 and is formed of a compound containing asphaltum and rock salt, which, will admit of a relative movement of the sheets 2 and 3 during the expansion and contraction of the adjacent blocks. As rock salt is one of the constituents of the filler, the same will'prevent the growth of vegetation between the sheets and the blocks. During the molding of the block B, the bulged portion 4 becomes embedded in the block and serves as an anchor, and, as shown in.F ig. 2, the bulged portion 4 contains a large portion of the ller 5, so as to admit of the bulged portion having suicient regidity and also to admit of the wall thereof eX- panding and contracting with the material forming the block B.

The lower ends of the sheets 2 and 3 are bentI and extended at right angles to the blocks, as shown at 6 and 7, and the plastic material, of which the blocks are formed, is

poured on the extensions 6 and 7 so as to embed the extensions within the material, the said extensions serving .t0 securely hold the sheets to the adjacent blocks and also to prevent the rowth of vegetation between the adjacent locks. i

The adjacent upper edges of the sheets 2 andw3. are folded and a binding element 8 extends around the edges of the sheets and serves to vprevent the escape of the liller from between the sheets.

In laying adjacent blocks, the expansion joint is placed at the required point with the extensions 6 and 7 lying on the ground or other surface. A board 9, shown in Fig. 1,

is positioned against the sheet 2 so yas to render the joint rigid during the molding of the blocks. poured, in the usual manner, on the opposite The plastic material is sides of the joint and on the extenslons 6 and 7, the plastic material forming the Cil block B contacting with the sheet 3 so as to admit of the forward portion 4 beino embedded within the metered. The peetie material forming the block C is held away from the sheet 2, by the board 9, and after the material has been molded into block formation, and before the material has set, the board 9 is removed so as to admit of the plastic material moving against the sheet 2, as shown in Fig; 2, to close the space between the sheet 2 and the block C.

Having thus described the invention what is claimed as new, is:

1. An expansion joint for concrete construction consisting of a pair of compressible sheets, one of the sheets having a bulged portion therein, and a filler within the bulged portion and formed of asphaltum and roc-k salt.

2; An expansion joint for concrete construction consisting of a pair of compressible sheets, one of the sheets having a bulged portion therein, and a ller within the bulged portion.

3. An expansion joint for concrete construction consisting of companion sheets of flexible material, a filler interposed between JOHN A. DE MOND.,

Witnesses:

E. M. SNOW, C. D. HORNER. 

